Enable a parameter by setting the corresponding bit to "1". Structure of data record 0: Byte 7 to 11 for scaling of measured valuesThe following table lists all measuring ranges of the analog input module along with their
codes. Enter these codes in byte 3 of the respective data record.
Table B- 3 Code for the measuring range
Measuring range Code
Voltage
±2.5 V
±5 V
±10 V
1 V to 5 V
0000 0111
0000 1000
0000 1001
0000 1010
Current 4-wire transducer
0 mA to 20 mA
4 mA to 20 mA
±20 mA
0000 0010
0000 0011
0000 0100The following tables list the valid hardware interrupt limits. The limit values depend on the
selected measuring type and range. The values that you can set for hardware interrupts
(high/low limit) must not exceed the respective rated measuring range.
Enter the limits in bytes 12 to 19 or 12 to 27 of the corresponding data record.
Table B- 4 Limits of hardware interrupts for voltage and current
This appendix shows the analog values for all measuring ranges supported by the AI 8xU/I
HF analog module.
Measured value resolution
Each analog value is written left aligned to the tags. The bits marked with "x" are set to "0".
Table C- 1 Resolution of the analog valuesThe tables below set out the digitized representation of the input ranges separately for
bipolar and unipolar input ranges. The resolution is 16 bits.The following tables list the decimal and hexadecimal values (codes) of the possible current
measuring ranges.
Table C- 6 Current measuring range ±20 mAError events initiate a diagnostics entry and trigger a diagnostics interrupt if configured
accordingly.
Table C- 8 Measured values for wire break diagnostic
Format Parameter assignment Measured values Explanation
• "Wire break" diagnostics enabled
• "Overflow/Underflow" diagnostics
enabled or disabled
("Wire break" diagnostics takes priority
over "Overflow/Underflow" diagnostics)
32767 7FFFH "Wire break" or "Open circuit" diagnostic
alarm
• "Wire break" diagnostics disabled
• "Overflow/Underflow" diagnostics
enabled
-32767 8000 H • Measured value after leaving the undershoot
range
• Diagnostic alarm "Low limit violated"
• "Wire break" diagnostics disabled

Overflow/Underflow" diagnostics
disabled
-32767 8000 H Measured value after leaving the undershoot
rangeThis manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel